Q1. For the Zener diode circuit below calculate the minimum input voltage required for stable regulation if it is given that Izk = 1.5 mA and Vz = 14 V. Assume that you are operating at the "knee" of the Zener curve with the Zener just switched on and regulating. Treat the diode as an ideal Zener, i.e. no resistance in the Zener. R 560 VIN
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- How is a solid-state diode tested? Explain.What is the zener diode and what are its advantages? In what region of their characteristic curve are zener diodes operated? At what value of zener current is the zener voltage normally specified? How does the zener impedance affect the voltage across the terminals of the device?C. In the circuit shown below the knee current for the ideal Zener diode is 10 mA Calculate the minimum value of load resistance RL in order to maintain 5 volts across the load resistance RL 2. WW-
- Q1/Consider the circuit in Figure with a transformer of 10:1 transformation ratio and the diodes are silicon. a) What type of circuit is this? (b) What is the total peak secondary voltage? (c) Find the voltage value across the resistor (d) Sketch the voltage waveform across RL (e) What is the PIV for each diode? D3 D 120 V Pisez) Vpouo D D 10 kn lleeeConsider the circuit with three diodes and a AC input, as shown below: D2 R1 D1 D3 R2 Assume that the input AC voltage is Ttsin(100TTT). You may consider the diodes to be ideal. mean voltage generated across resistor R2 is (assuming current direction to be from AC so into R1, through diode network, and through R2 from top to bottom): O a. 0.5V Ob. -0.5V O c. 1V O d. OVFor the circuit shown below, compute the maximum current through each resistor when terminal A is a) positive and, b) negative. Assume the diodes are ideal. (Will we convert to the RMS value to it's actual value?)
- Consider the circuit shown in Figure 2. The cut-in voltage of each diode is . Let and assume both diodes are conducting. Determine if this is a valid assumption and explain your answer. And calculate the values of IR, ID, Ip2, and V.. Rj =1.7 kQ ww VB =1 V D1 Dz R2D 4 kQ Figure 2For the rectifier in the figure below, state the conduction sequence of the diodes for periods t1 to tó. D1 D2 D3 22) tl: D. & D.. 23) t2: D. & D.. 24) t3: D. & D.. 25) t4: D. & D.. D4 D5 D6 26) t5: D. &D. 27) t6: D.AN A & D....... Vm cot t6Zener diodes are special purpose diodes designed to operate in their breakdown regions. Describe the working principle and characteristics of a typical Zener diode found in the market place. The Zener-diode regulator circuit shown below is to be used to provide a stabilised output to the load. The zener diode characteristic is also shown. Find the load voltage and source current if the battery voltage is 20 V, series resistance is 1.4 kohm and load resistance is 6 kohm
- Q1. For the Zener diode circuit below calculate the minimum input voltage required for stable regulation if it is given that Izk = 1.5 mA and Vz = 14 V. Assume that you are operating at the "knee" of the Zener curve with the Zener just switched on and regulating. Treat the diode as an ideal Zener, i.e. no resistance in the Zener. R 560 ? VIN Answerconsider the figure below that shows an approximated reverse recovery turn-off characteristics for a power diode. Show that the following relation can express the total reverse recovery charge, Qrr = 1/2(trr*ts1) di1/dt =1/2(trr*ts21) di2/dt * ip Isl 1s2! -Ir4. For the circuit shown in the figure below uses a transformer of 230V/12V-0-12V and all diodes are Ge find the following, RL-3.3k2. The name of the circuit is ........ Current through the load is............The DC output voltage is............ Draw the input & output wave forms ✈ ellel eetee CT D₂ DE www R₂